Maths problem

[Duckduck]

  On 4/14/2015 at 6:59 AM, Joseph22 said:

Which part of the question say that there is no unique date?? It was not stated in the question that Albert saw no unique date in the month. Hence I say the explanation seems not right.

 

Disclaimer. I just want to clarify because the explanation of elimination doesn't sound right.

 

i already explained n 1 thing i wanna add: its basically abt double complementary numbers, but whoever set the question wrote it with grammatical errors.

[Joseph22]

  On 4/14/2015 at 7:02 AM, Ender said:

It's not stated, that's why you have to infer from how Albert can be very sure Bernard doesn't know the birthday at first.

If Bernard number is 14. He can still declare that Albert don't know the date right?

  On 4/14/2015 at 7:03 AM, Duckduck said:

 

i already explained n 1 thing i wanna add: its basically abt double complementary numbers, but whoever set the question wrote it with grammatical errors.

So can I say the confusion wasn't really because of us but the way the question is set?? If yes.. I accept😂😂😂

Edited April 14, 2015 by Joseph22

[Duckduck]

  On 4/14/2015 at 7:04 AM, Joseph22 said:

If Bernard number is 14. He can still declare that Albert don't know the date right?

 

yes but u must include that may n june have been eliminated based on albert's first sentence, then with wats left, u use double complementary to remove 14 n aug so left july 16

Edited April 14, 2015 by Duckduck

[RH1667]

Actually, I don't understand why is this question consider a maths question?

[Ender]

  On 4/14/2015 at 7:06 AM, Joseph22 said:

If Bernard number is 14. He can still declare that Albert don't know the date right?

 

Yes if bernard has 14 , he can still declare Bernard doesn't know the date, so is 15 or 16. But the 1st statement that albert made doesn't pin point the day, but eliminate the two month.

 

 

Let's take it step by step. Still on 1st statement of eliminating the month of May and June

 

If Albert was given May, can he be sure that Bernard doesn't know the exact date? No he can't be sure, as it contain a unique date, there's still a chance Bernard may have know the exact date if Bernard was given he unique number

 

If Albert was given June, can he be sure that Bernard doesn't know the exact date? No he can't be sure, as it contain a unique date, there's still a chance Bernard may have know the exact date if Bernard was given he unique number

 

If Albert was given July, can he be sure Bernard doesn't know the exact date? Yes he can be sure, as both numbers 14 and 16 are not unique.

 

If Albert was given August, can he be sure Bernard doesn't know the exact date? Yes he can be sure, as the numbers 14,15 and 17 are not unique.

 

So as of 1st statement, Albert was given either July or August.

Edited April 14, 2015 by Ender

[Joseph22]

  On 4/14/2015 at 7:31 AM, Ender said:

Yes if bernard has 14 , he can still declare Bernard doesn't know the date, so is 15 or 16. But the 1st statement that albert made doesn't pin point the day, but eliminate the two month.

 

 

Let's take it step by step. Still on 1st statement of eliminating the month of May and June

 

If Albert was given May, can he be sure that Bernard doesn't know the exact date? No he can't be sure, as it contain a unique date, there's still a chance Bernard may have know the exact date if Bernard was given he unique number

 

If Albert was given June, can he be sure that Bernard doesn't know the exact date? No he can't be sure, as it contain a unique date, there's still a chance Bernard may have know the exact date if Bernard was given he unique number

 

If Albert was given July, can he be sure Bernard doesn't know the exact date? Yes he can be sure, as both number 14 and 16 are not unique.

 

If Albert was given August, can he be sure Bernard doesn't know the exact date? Yes he can be sure, as both number 14,15 and 17 are not unique.

 

So as of 1st statement, Albert was given either July or August.

 

ah okay. I understand Liao. I didn't read the question clearly. I thought the first comment is by the one who know the date when actually it's the month. silly me. Had been screwing the cow horn for nothing.

 

Thanks. Re read the question after ur explanation let me realise my mistake.

  On 4/14/2015 at 7:21 AM, RH1667 said:

Actually, I don't understand why is this question consider a maths question?

Logic. Math is not just about +-x/ it's also about logic.

  On 4/14/2015 at 7:07 AM, Duckduck said:

 

yes but u must include that may n june have been eliminated based on albert's first sentence, then with wats left, u use double complementary to remove 14 n aug so left july 16

Thanks. Realise my mistake Liao.

[SuPerBoRed]

.. you guys still talking abt the qn ah... juz be thankful all these ''questions'' have no impact what so ever with real working life

[Evillusion]

so does this means july 17 becomes a public holiday....?

[Ahseng]

Whatever standard this is, be it P5, or sec 3 or sec 4, my head hurts from trying to solve it.

 

I think i just belong in the under P3 standard...or maybe even lower.

 

Godamn! and now i worry for my kids

[Joseph22]

  On 4/14/2015 at 7:52 AM, SuPerBoRed said:

.. you guys still talking abt the qn ah... juz be thankful all these ''questions'' have no impact what so ever with real working life

Think those of us here discuss because we love math.

[Ender]

  On 4/14/2015 at 7:57 AM, Joseph22 said:

Think those of us here discuss because we love math.

Actually bro Superbored's explanation is the one that made me understand..

[Joseph22]

  On 4/14/2015 at 8:08 AM, Ender said:

Actually bro Superbored's explanation is the one that made me understand..

Okay. He is the expert. No wonder he frustrated because we still discuss after he explain.😂😂

[Angcheek]

  On 4/14/2015 at 7:31 AM, Ender said:

Yes if bernard has 14 , he can still declare Bernard doesn't know the date, so is 15 or 16. But the 1st statement that albert made doesn't pin point the day, but eliminate the two month.

 

 

Let's take it step by step. Still on 1st statement of eliminating the month of May and June

 

If Albert was given May, can he be sure that Bernard doesn't know the exact date? No he can't be sure, as it contain a unique date, there's still a chance Bernard may have know the exact date if Bernard was given he unique number

 

If Albert was given June, can he be sure that Bernard doesn't know the exact date? No he can't be sure, as it contain a unique date, there's still a chance Bernard may have know the exact date if Bernard was given he unique number

 

If Albert was given July, can he be sure Bernard doesn't know the exact date? Yes he can be sure, as both numbers 14 and 16 are not unique.

 

If Albert was given August, can he be sure Bernard doesn't know the exact date? Yes he can be sure, as the numbers 14,15 and 17 are not unique.

 

So as of 1st statement, Albert was given either July or August.

 

 

Yap ... some playing with english too ..... bec A said he knew B also dont know.

 

Maybe B showed A this face -->

  On 4/14/2015 at 7:52 AM, SuPerBoRed said:

.. you guys still talking abt the qn ah... juz be thankful all these ''questions'' have no impact what so ever with real working life

 

 

Real life can be even more complicated .............

[Agnoxis]

The English a bit fail in this question but the logic does apply. If you can understand their English, it can be solved within 3min. If not, then you can take a whole day. But once someone explains to you how to get the answer, then you'll go ORHHHH...

 

I just took a piece of paper, wrote down the months and dates in 2 columns and the answer came to me pretty quickly...

[Stevle]

  On 4/14/2015 at 7:52 AM, SuPerBoRed said:

.. you guys still talking abt the qn ah... juz be thankful all these ''questions'' have no impact what so ever with real working life

Yup, in real life the boss will be more interested in how much businesses one can bring for the company and not wasting time on thinking an answer for this type of question.... haha...

[Sturtles]

  On 4/13/2015 at 3:39 AM, SuPerBoRed said:

 

exact phrasing.. '' i dont know when cheryl's birthday is, but i know bernard does not know also''

 

from the guy who knows the month... for him to be able to say that ... he HAS to know that it CANNOT be in MAY and JUNE

 

kapish?

 

 

Still didn't manage to make the logic jump from unique day to the excluded months.

 

I guess my English is too poor to attempt this question..

[Ben5266]

  On 4/14/2015 at 6:49 AM, Joseph22 said:

Problem is how he eliminate the month of May. Because it's not 19 so cannot be may is too weak an argument. July wise is straight forward to eliminate. Only two date with one been rare. So the other date confirm the guy who know month won't be able to tell.

because, Bernard says he now know.

Meaning, cannot be May as May still has 2 dates.

[Angcheek]

  On 4/15/2015 at 11:09 AM, Sturtles said:

 

 

Still didn't manage to make the logic jump from unique day to the excluded months.

 

I guess my English is too poor to attempt this question..

 

 

A only knows the month and B knows the day.

 

So if A says he is very sure B does not know the BD too. meaning ,

If the BD is other date in May or June, A cannot say he is Very Sure B does not know. (he can only say Maybe B will know. which is not the case here)

 

Since there is unique date in May and June , A cannot be 100% sure B Does not know too. The fact he is very Sure , means it is not within those 2 months lor

 

This way can liao kai bo ?

 

 

If still cannot ... I give you this ....

 

https://www.youtube.com/watch?v=18xXPnlnb2I

Edited April 15, 2015 by Angcheek